摘要
为进一步提高配电网故障选线准确性,提出一种基于馈线零序全电流与母线零序全电压变化率互相关性分析的单相接地故障选线方法。通过分析中性点非有效接地系统中馈线零序电流和母线零序电压间关系,发现非故障馈线上零序全电流波形与母线零序全电压变化率波形变化趋势相同,而故障馈线上两者之间变化趋势相反或不存在明确的线性关系。首先,求取母线零序全电压变化率;然后,基于波形相似度原理定量分析各馈线零序全电流与母线零序全电压变化率的互相关系数;最后,构建互相关系数组,通过组内数据与阈值比较完成故障选线。仿真试验及现场数据分析结果表明,所提选线方法准确且适应性强。
In order to further increase the accuracy of fault line selection in distribution network,a single-phase-to-ground fault line selection method based on cross-correlation analysis of feeder zero-sequence full current and bus zero-sequence full voltage change rate was proposed.By analyzing the relationship between the zero-sequence current of the feeder and the zero-sequence voltage of the bus in the non-effectively earthed neutral system,it was found that the zero-sequence full-current waveform on the non-faulted feeder and the zero-sequence full-voltage change on the bus had the same trend,while the change trend between the twos on the faulted feeder was opposite or there was no clear linear relationship.First,the change rate of the bus zero-sequence full voltage was calculated;then the cross-correlation coefficient between the zero-sequence full current of each feeder and the change rate of the bus zero-sequence full voltage was quantitatively analyzed based on the waveform similarity principle;finally,construct the cross-correlation coefficient array,and complete the fault line selection by comparing the data in the array with the threshold.The simulation test and field data analysis results show that the proposed line selection method is accurate and adaptable.
作者
王铭
祝石林
Wang Ming;Zhu Shilin(Shandong University of Petrochemical Technology,Dongying Shandong 257000,China;Qingdao University of Science and Technology,Qingdao Shandong 266002,China)
出处
《电气自动化》
2023年第4期16-19,22,共5页
Electrical Automation
基金
东营市科技发展基金项目(DJ 2021011)。
关键词
中性点非有效接地
接地故障
故障选线
全电流
电压变化率
互相关性
non-effectively earthed neutral
grounding fault
fault line selection
full current
voltage changing-rate
cross-correlation
